[Update: Not really] Motorola Moto G and Moto E series will likely be phased out
Last week, Motorola and Lenovo confirmed that the "Motorola" brand would no longer be used on smartphones. But Motorola Mobility will still exist as a Lenovo subsidiary, with high-end handsets being released under the "Moto" brand, and mid-range and low-end models being gathered under the "Vibe" brand (which is already used by Lenovo).
According to some media reports, Lenovo also confirmed that the Moto G and Moto E series of smartphones would be phased out. However, the reports are based on an article from Sina (in Chinese - see the first source link below) which doesn't specifically say that the Moto G and Moto E series will disappear. Still, since these series don't include high-end devices, the new Moto-Vibe branding strategy will likely eliminate the Moto G and Moto E names anyway.
This year, Lenovo and Motorola Mobility are planning to release about 15 new Moto and Vibe smartphones. Assuming that the Moto G and Moto E series are indeed being phased out, we might still see successors to the latest models (Moto G 2015 and Moto E 2015), though these should be included in the Vibe series.
sources: Sina (translated), The Verge, Digital Trends